T1D1 Mobile
Type1 Insulin Calc FDA-Cleared
Only for iPhone
Free
iPhone
The first, and ONLY, FDA cleared over-the-counter insulin/bolus calculator for Type 1 Diabetes!
T1D1 (Type 1 Diabetes from Day 1), all the essentials you need to get started from day 1 of diagnosis.
100% free - No subscription and no in-app purchases!
Who is it for? People with Type 1 Diabetes who…
-Need help calculating insulin!
-Are newly diagnosed with Type 1 Diabetes
-Use multiple daily injections (MDI) of short-acting insulin
-Work with School nurses
-Have caregivers who assist in diabetes management
-Want to send their data to healthcare providers
-Are taking a break from using a pump
-Count carbs but are NOT on a sliding scale
T1D1 implements the bolus dosing calculation as indicated by the American Diabetes Association standards of Care (https://diabetesjournals.org/care/issue/48/Supplement_1) without modifications.
T1D1 is intended for people with Type 1 Diabetes aged 2 years and older who use multiple daily injections (MDI) of rapid-acting insulin. The user can calculate insulin doses based on user-entered data, track glucose, insulin, and carb intake, and share information with their healthcare team.
Designed to be simple and accessible, T1D1 makes it easier for patients and families to manage the daily math of diabetes.
About the creator:
My name is Drew Mendelow. I was 13 years old when I was diagnosed with Type 1 Diabetes in 2020. I remember feeling so overwhelmed when I was newly diagnosed and wanted to create an app with just the essentials you need from day 1 of diagnosis. My aim is to make it simple, reliable, and accessible to all… for free! Hope this app makes your life just a little easier.
Disclaimer:
T1D1 is an FDA-cleared, Class II medical device for over-the-counter use. Before use, a healthcare professional must provide your target blood glucose values, insulin-to-carbohydrate ratios, and correction factor (aka insulin sensitivity factor) to be programmed into the app.
While the app is designed to support insulin dosing for individuals with Type 1 Diabetes Mellitus (T1DM) from age 2 and older, for children under 13, a parent or legal guardian must create and manage the account on the child’s behalf.
Legal Manufacturer:
Comerge AG
Bubenbergestrasse 1
Zurich, 8045
Switzerland
Added a resource page. Minor back-end updates
The developer, T1D1, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- T1D1 LLC
- Size
- 47.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
- Medical Device
Yes
- T1D1 indicated this app is a regulated medical device and complies with United States law.
- The information below has not been verified by Apple.
- FDA Owner/Operator Number
- 10086348
- Address
- 16200 Kimberly Grove Rd
Gaithersburg Maryland 20878-2265
United States - Phone Number
- +1 301-213-2906
- info@t1d1.org
- Use Statement
- The T1D1 mobile application is indicated for the management of diabetes by people with Type 1
diabetes age 2 and older by calculating insulin doses based on user-entered data.
Prior to use, a healthcare professional must provide the patient target blood glucose values,
insulin-to-carbohydrate ratios, and the correction factor (also known as the insulin sensitivity factor) to be programmed into the App software. - Safety Information
- You should not use the T1D1 application if you:
● have not received a diagnosis of T1D from a healthcare provider
● have not obtained a treatment plan from a healthcare provider (patient-specific target blood
glucose, insulin-to-carbohydrate ratio, and the correction factor)
● are not using Multiple Daily Injections of rapid-acting insulin
● are caring for someone with Type 1 Diabetes that is younger than 2 years old
● are not monitoring your blood glucose (BG) levels as advised by a healthcare provider
● are taking any diabetes medications that are not prescribed by a healthcare provider
● are using a sliding scale or do not count carbs - Instructions for Use
- Visit the developer site
- Copyright
- © 2026 T1D1